package collection;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class SortListDemo2 {
    public static void main(String[] args) {
        List<Point> list = new ArrayList<>();
        list.add(new Point(13,28));
        list.add(new Point(3,4));
        list.add(new Point(50,60));
        list.add(new Point(7,8));
        list.add(new Point(90,100));
        System.out.println(list);
        //Collections.sort(list);//编译错误 该sort方法要求元素必须实现Comparable接口
        Collections.sort(list,new Comparator<Point>() {
            public int compare(Point o1, Point o2) {
                int len1 = o1.getX() * o1.getX() + o1.getY() * o1.getY();
                int len2 = o2.getX() * o2.getX() + o2.getY() * o2.getY();
                return len1 - len2;
            }
        });
        System.out.println(list);
    }
}
